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Blast furnace trough and runner materials

The main trough, iron runner, slag runner, tilting runner and others are employed on the casthouse floor to transfer the molten iron tapped from the blast furnace to torpedo cars. Appropriate refractory materials are applied to the respective troughs in consideration of operational conditions.
To maintain stable molten iron transfer and sufficient durability even under severe operational conditions of relatively high productivity coefficients or relatively high iron temperatures, Krosaki Harima Corporation selects and recommends the optimal trough materials for client's blast furnace operation being based on abundant field performance.

Selecting materials appropriate for each portion

General requirements of trough and runner are

*Easy to install (appropriate fluidity and hardening time)
*Corrosion resistance (resistance against slag and FeO attack)
*Abrasion resistance
*Oxidation resistance
*Thermal spalling resistance

Generally in the main trough, local wear damage is observed at the slag line (the air/slag interface) and also at the metal line (the slag/metal interface). Plotting the entire wear to be as even as possible Krosaki Harima Corporation carefully selects and recommends the optimal materials for each trough portion.

Normal application for main trough lining
At slag line:SiC material of high silicon carbide content for excellent resistance against slag attack
At metal line:Spinel material with lower silicon carbide content for excellent resistance against FeO attack

Wet gunning repair for blast furnace troughs

The gunning repair is effective to achieve longer durability of troughs, by which the trough maintenance schedule can be optimized.

Wet gunning materials supplied by Krosaki Harima Corporation are characterized by

*Forming a sufficiently dense lining with less water
*Being suitable for hot gunning even immediately after draining
 residual molten iron from the trough

Trough refractory lining after installation

Trough refractory lining after installation

Hot trough refractory lining (immediately after draining residual molten iron)

Hot trough refractory lining (immediately after draining residual molten iron)

Trough refractory lining after hot service

Trough refractory lining after hot service

 

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